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1989 964 C4 oil level readings cold vs. hot


Vehicle Information: Model: 964; Year: 1989; Body Type: Coupe; Total Mileage: 66000;

I am much more familiar with older 911's with two oil coolers. This car has evidence of oil in the intake and another shop went through fits trying to fix it. We found the oil tank level seems too high for the temperature which is very hard to get above the bottom peg. If the car is driven like a track car the temperature goes to mid range and the level gauge reads half scale while the stick registers about 1-1 1/2 qts low. As soon as the car is driven street style the temp falls to lowest white peg above bottom (first below normal range). When the engine is first started luke warm the level gauge pegs when the engine starts and drops slightly but doesn't fall to half range until the car is driven at 3000 rpm for a moment. This is almost backwards to the normal 911 with engine oil cooler plus remote. Does the oil tank reading behave differently when only one thermostat is employed? By the way, we did replace the thermostat and housing due to rumors about casting problems in the thermostat housing. True or false rumors? Is it normal for oil to be dripping from the throttle plenum?

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